Spindle



H. A. TlFFANY SPINDLE. APPUQATION FILED MAR. 19, I921.

1,414,905, t mayzmz.

I I I INVENTOR' WITNESS Arm/Mr crates,

HOMER A. TIFFANY, OF EATER/SON, NEW JERSEY, ASSIGNOR TO BENJAMIN BUGKLEYS SO1\T,'I1\TC., on rnrnnson, NEW JERSEY, noonronn'rion or DELAWARE.

SPINDLE.

atinos,

Specification of Letters Patent.

Patented May 2, 1922.

Application filed. March 19, 1921. Serial No. 453,650.

cant receivers in its bolster at the upper and lower parts of the bearing portion of its spindle proper and a passage connecting said receivers. This passage has heretofore usually been a groove formed in the bolster and open for its full length to the bore thereof,

the theory of lubrication of the device being that when the spindle proper is rotating the lubricant will be kept in circulation, passing from one receiver to the other via the groove and back again between the wiping surfaces of the spindle proper and bore. In practice, however, the speed of the spindle proper is limited because overflow takes place if a cer tain speed is exceeded, making frequent oiling and cleaning necessary; evidently the groove, which normally takes care of the return of the lubricant from the upper to the lower receiver, becomes so completely choked by lubricant as an incident to the centrifugal force set up by the spindle proper, to which the groove for its full length is exposed, that the lubricant in the upper receiver can no longer escape by the groove. In the spindle herein set forth I have so far overcome this defect that overflow of the lubricant is avoided substantially regardless of the speed of the spindle proper; and I have accomplished this result without unduly weakening any of the parts. This desired construction is attained by casting (as die-casting) the bolster with an interior upright groove in its bore and then driving a bearing sleeve into the bore so that when the spindle proper is entered into the sleeve the latter at once affords a bearing for the spindle proper and leaves the receivers formed and having communication with each other by two distinct ways, to wit, via the groove (now a duct) and via the bearing, between the surface thereof and of the spindle.

In the accompanying drawing,

Figure 1 shows the improved spindle partly in side elevation and partly in vertical section; and

Figures 2,- 8, 4: and 5 are sectional views on the lines 2- 2, 3 8, 4l-t and 5 5 of Figure 1.

The bolster a has its bore Z) doubly enlarged, once at c to a depth suitable for the reception of the aforesaid sleeve and again at (Z for the formation ofthe upper receiver. In the bottom is a step-bearing e for the spindle. The bolster is cast with an upright groove f opening inward to said bore and extending from the shoulder g forming the terminus of the second counterbore d and the bottom of said receiver to the step-bearingJ Into the first counterbore 0 is driven with a tight fit a bearing sleeve h, The first counterbore 0 represents about one-half the depth of the bore 6, measured from the top of bolster to the step-bearing e, and the length of this sleeve, which is driven, in until it abuts the terminus of the counterbore c, is somewhat less than the length of the latter so that its top is more or less below the top of the bolster. It will be noted that the sleeve isolates the upper part of the groove 7 from the bearing afforded by the sleeve in the bearing member which the thussleeved bolster now constitutes.

z is the spindle proper which is of conventional form, its bearing portion comprising a cylindrical part a, which when the spindle is in place terminates at its lower end in coincidence with the lower end of the sleeve, which it fits snugly but so that the spindle proper may rotate freely, and a downwardly tapering part i which is stepped in the step-bearing e. The upper receiver j is formed around the spindle proper by the counterbore (Z and sleeve; the lower receiver 10 is formed around the tapered part 2' of the spindle proper in the bore 6. Communication, to the end that lubricant may pass from one to the other receiver when the spindle proper is rotating, is afforded by way of the duct f which is left at that part of groove 7 which is covered by the sleeve, and also between the wiping surfaces of the spindle proper and sleeve, or through the bearing in the sleeve.

Since the duct f is not exposed to the spindle proper, that is, to the counteracting influence of the lubricant which is passing from one receiver to the other between the spindle proper and sleeve, the flow of lubricant therethrough takes, place unimpeded and so the matter of circulation no longer thereof while leaving the lower part of said groove uncovered, and a spindle properiitting and rotative in said bearing, the bolster forming an upper lubricant receiver around the spindle proper and also having a lower lubricant receiver and said receivers having the sleeve intervening between them and communicating with each other for passage of lubricant via said groove and between thebearing and spindle proper.

In testimony whereof I affix my signature.

HOMER A. TIFFANY. 

